Your first course of experimentation is to shuffle downstairs and look to find your sister April--27, and the same color hair as yourself but much straighter--sitting in the dining room with a sandwich and a tablet in front of her at the table.
"...hey." You say, sitting across the table from her, feeling a poof of air flow up against you from your diaper.
"Hi!" April responds, breaking her attention from whatever she was doing.
You stare awkwardly at her.
"Welp, that's all I had to say." You shrug.
"Hey Damy," April asks as she swallows a bite of sandwich, "do you have Tree of Life?"
"No..." You sigh softly and lean back in the chair.
"Okay, I wanna watch it some time." She takes another bite.
"Okay." You start to fold your arms, when you realize that you're wetting yourself.
You let it come out for a second; the feeling of the sharp wetness flowing and expanding like a bubble inside tickles you. You try to stop the flow just to see if you can, and you can't even locate the muscles that control that anymore; like part of your body isn't there.
"I think I've heard some people at work talk about it." You add as you let soaking continue.
"Hey Damy..." April finishes another bite.
"Yeah?"
"Do you ever feel like you're not in your own body? That like, you're looking at yourself move around, and you feel like you're watching someone else and just observing instead of doing anything?" She looks at you intently.
"...uhhhmm..." your wetting ends, "...yeah, definitely!" You nod.
You grunt and get up from your chair.
"I gotta change." You say as you slide your chair back.
"Kay." April says, looking at you for a moment and going back to her tablet.
You turn around, and your diaper squishes back and forth as you walk up and over to the second floor bathroom. You see a large diaper pail next to the trash can, and a package of the kind of diaper you're wearing sitting right there on the counter, surrounded by the likes of shampoo and soap bottles. Actually, the package is mostly empty; with only two left inside. Getting a fun idea, you grab these two diapers and leave the bathroom, sitting them on your desk, then returning to the bathroom--which now has a completely empty package sitting on the counter.
Locking the door and closing the blind like you (in your new memory) always do, you push down your pants and sit on the toilet. You open your diaper up, take the wipes off the counter and begin deftly wiping yourself at an efficiency that surprises you, but also is what you're used to. Blegh, having two sets of memories is really messing with you. You aren't even doing as good as you're supposed to because your non-incontinent self keeps getting in the way.
Anyways, you ball up your diaper with the wipes inside, pop it in the bin, and pretend to be shocked that you're out of changes. Your pants stretched awkwardly against your ankles, you waddle over to the door, peek your face through and shout,
"HEY APRIL!"
You stand there, waiting for her to start up the stairs and you recess into the door.
"Yes?" Your sister asks eagerly.
"There's no diapers in here." You explain. "Could you please get me one?"
"Oh, yea." You hear her reply, shuffling into your room and back.
You creep the door open as she hands one in through the gap.
"You had two on your desk." She rolls her eyes.
"Thank you so much." You take the diaper and start immediately wrapping it around you and taping it up. Just as you grab for your pants, April--who hadn't left the hallway--swings open the door and makes you move to the side as she goes and grabs the empty package on the counter. Your original self is a little startled by this, but your new self knows that you don't have that much privacy in this reality.
She balls up the empty package and leaves the room, going downstairs, then in a second coming back up with a new package. Just as you're fastening your belt, she's bumping in and placing it on the counter. She digs her hand into the corner and tears open a gap, and gently pulls a diaper three-inches out for easy grabbing. She gives you a, "oh you. I have to do everything for you, heheh." look, and exits the bathroom as you do.
I suppose in a self-aware 'overprotective' state of mind, she comes up behind you and grabs the back hem of your pants.
"I've told you so many times," she says, smiling as she grabs the back-end of your diaper and un-rolling it; making the edge material go upwards and poke a full inch out the top of your pants, "rolling it up like that makes it air out less." She spins you around and does the same for the front. "Makes it sweaty, and might cause a rash." She grabs the end of your shirt and drapes it over the exposed whiteness, stretching it down your waistline. She pats your left thigh, coos and goes down the stairs.